Dual stat skills not activating

[Speedchain]

I did some calcs in the stat calculator and found out that wt is used twice in the dual stat activation calculation. This means that you need +6 for 0wt, +8 for 1wt, +10 for 2 wt and +12 for 3wt. It also works the other way around so that if your opponent is holding a brave weapon you can activate with 0wt if your combined stats are 2 lower than your opponent's. This is probably the reason why twins don't activate dual stat skills at the moment.

I also noticed that all hp dual stat skills activate at +4 so it's not the hp that is used wrong in the formula. 40/20 activated against 40/16 while 40/20 against 36/20 does not.